epsagon-go

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Published: May 12, 2020 License: MIT

README


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Epsagon Tracing for Go

This package provides tracing to Go applications for the collection of distributed tracing and performance metrics in Epsagon.

Contents

Installation

To install Epsagon, simply run:

go get github.com/epsagon/epsagon-go

Or using dep:

dep ensure -add github.com/epsagon/epsagon-go

Frameworks

The following frameworks are supported by Epsagon:

Framework Supported Version Auto-tracing Supported
AWS Lambda All
  • - [ ]
AWS Lambda

Tracing Lambda functions can be done in the following method:

package main

import (
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/epsagon/epsagon-go/epsagon"
	"log"
)

func myHandler(request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
	log.Println("In myHandler, received body: ", request.Body)
	return events.APIGatewayProxyResponse{Body: request.Body, StatusCode: 200}, nil
}

func main() {
	log.Println("enter main")
	lambda.Start(epsagon.WrapLambdaHandler(
        epsagon.NewTracerConfig("app-name-stage","epsagon-token"),
        myHandler))
}

Integrations

Epsagon provides out-of-the-box instrumentation (tracing) for many popular frameworks and libraries.

Library Supported Version
net/http Fully supported
aws-sdk-go >=1.10.0
net/http

Wrapping http requests using the net/http library can be done by wrapping the client:

import (
	"github.com/epsagon/epsagon-go/wrappers/net/http"
...
	client := epsagonhttp.Wrap(http.Client{})
	resp, err := client.Get(anyurl)
aws-sdk-go

Wrapping of aws-sdk-go is done through the Session object that has to be created to communicate with AWS:

import (
...
	"github.com/epsagon/epsagon-go/wrappers/aws/aws-sdk-go/aws"
)
    ...
	sess := epsagonawswrapper.WrapSession(session.Must(session.NewSession()))
	svcSQS := sqs.New(sess)

Configuration

Advanced options can be configured as a parameter to the Config struct to the WrapLambdaHandler or as environment variables.

Parameter Environment Variable Type Default Description
Token EPSAGON_TOKEN String - Epsagon account token
ApplicationName - String - Application name that will be set for traces
MetadataOnly EPSAGON_METADATA Boolean true Whether to send only the metadata (True) or also the payloads (False)
CollectorURL EPSAGON_COLLECTOR_URL String - The address of the trace collector to send trace to
Debug EPSAGON_DEBUG Boolean False Enable debug prints for troubleshooting
SendTimeout EPSAGON_SEND_TIMEOUT_SEC String 1s The timeout duration to send the traces to the trace collector

Getting Help

If you have any issue around using the library or the product, please don't hesitate to:

  • Use the documentation.
  • Use the help widget inside the product.
  • Open an issue in GitHub.

Opening Issues

If you encounter a bug with the Epsagon library for Go, we want to hear about it.

When opening a new issue, please provide as much information about the environment:

  • Library version, Go runtime version, dependencies, etc.
  • Snippet of the usage.
  • A reproducible example can really help.

The GitHub issues are intended for bug reports and feature requests. For help and questions about Epsagon, use the help widget inside the product.

License

Provided under the MIT license. See LICENSE for details.

Copyright 2020, Epsagon

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